CN203474749U - Powdering and drying system of low-rank coal with high water content - Google Patents
Powdering and drying system of low-rank coal with high water content Download PDFInfo
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- CN203474749U CN203474749U CN201320523385.0U CN201320523385U CN203474749U CN 203474749 U CN203474749 U CN 203474749U CN 201320523385 U CN201320523385 U CN 201320523385U CN 203474749 U CN203474749 U CN 203474749U
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Abstract
The utility model relates to a powdering and drying process of low-rank coal with high water content and a system thereof. According to the powdering and drying process and the system, the problems that the predrying needs to be carried out before the coal is ground, the operation cost and the equipment investment are large and the energy consumption is high in the existing powdering and drying process are solved. The technical scheme is as follows: the system comprises a coal grinding machine, wherein the coal grinding machine is connected with a first-stage bag type filter, a fluidized bed or an entrained-flow bed dryer and a second-stage bag type filter in sequence; and a flue-gas inlet of the coal grinding machine and a hot-flue-gas inlet of the fluidized bed or an entrained-flow bed dryer are connected with a flue-gas outlet of a coal-powder boiler. The powdering and drying process and the system have the advantages that the system is simple, the control is simple and convenient, the drying effect is good, the operating cost is low, the equipment investment is low, the occupied area is small and the system is safe and reliable.
Description
Technical field
The utility model relates to a kind of powder process and dehumidification system of chemical industry, specifically a kind of powder process of high moisture low-rank coal and dehumidification system.
Background technology
Along with expanding economy, the emphasis of clean utilization Jiang Shi China energy utilization of coal.Successfully develop at present that all kinds of coal adaptabilities are wide, vapor pressure is high, throughput is large, gasification efficiency is high, pollute few coal gasifying process of new generation, wherein more typical gasification technology has the strange pressurization static bed gasification technology in Shandong, KBR fluidized-bed or entrained flow bed gasification technology and SHELL entrained flow bed gasification technology.Although coal obtains clean fuel through advanced gasification technology or other elementary Chemicals have broad application prospects in China.But various gasification technologies all have self advantage, shortcoming and adaptability, as fixed bed gasification often adopts lump coal as raw material, higher to the lump coal proportion requirement in feed coal, coal for gasification water content is generally more low better, and general requirement is no more than 8%; And for example fluidized-bed or entrained flow gasification general requirement are broken into raw coal in the fine coal of the particle diameter of < 10mm, < 1mm particle diameter fine powder should be controlled at below 10%, and the coal water content < 5% that enters vapourizing furnace is advisable.Given this, general feed coal required all to need to do coal-grinding and drying treatment according to its gasifying process before gasification.
Take SHELL gasifying process as example, and traditional mill coal drying technique generally adopts medium-speed pulverizer abrasive dust, hotblast stove that the technical process of thermal cycling air dry coal dust is provided.When the water content of feed coal is 25% when following, this kind of mill coal drying technique has its technology and economic advantages, but when in feed coal, water content surpasses 25%, the be heated restriction of the equipment tolerable temperatures such as circulation gas tolerance and coal pulverizer, for being dried to the qualified coal dust compared with low water content, need to before coal-grinding, configure pre-drying device feed coal is carried out to pre-treatment, can greatly improve plant investment like this, affect the economy of gasification installation.
Summary of the invention
The utility model relate to a kind of system simple, control easy, drying effect good, running cost is low, facility investment is low, floor space is little, security of system powder process and the dehumidification system of high moisture low-rank coal reliably.
Powder process and the dehumidification system of the moisture low-rank coal of described height, comprise coal pulverizer, described coal pulverizer is connected successively with one-level deep bed filter, fluidized-bed or air flow bed moisture eliminator, secondary deep bed filter successively, and the hot gas approach of the gas approach of described coal pulverizer and fluidized-bed or air flow bed moisture eliminator is connected with the exhanst gas outlet of pulverized coal firing boiler.
The pneumatic outlet of described one-level deep bed filter and secondary deep bed filter is connected with the hot exhanst gas outlet of pulverized coal firing boiler through tail-gas compressor.
The powder process and the drying process that are used for the moisture low-rank coal of said system, comprise when feed coal is sent into coal pulverizer and carried out coal-grinding fully dry by the combustion product gases from pulverized coal firing boiler, coal dust after coal-grinding and gaseous mixture are sent into one-level deep bed filter and are filtered to isolate coal dust and gas, coal dust after filtration is sent into fluidized-bed or air flow bed moisture eliminator by the abundant fluidisation of the combustion product gases from pulverized coal firing boiler and dry, dried coal dust and gaseous mixture are sent into secondary deep bed filter and are isolated coal dust and gas, and described coal dust is delivered to coal dust bunker and stored.
Describedly after one-level deep bed filter and the isolated gas of secondary deep bed filter part are mixed with the combustion product gases of pulverized coal firing boiler after gas compressor compression, send into coal pulverizer and fluidized-bed or air flow bed moisture eliminator, rest part is outer row after treatment.
The volume ratio of mixing of the combustion product gases of described gas after gas compressor compression and pulverized coal firing boiler is 0.5:10～2:10.
Contriver has changed the dry mode that conventionally adopts predrying combination mill coal drying technique of feed coal in the past, before coal-grinding, do not carry out predrying, but by employing fluidized-bed or air flow bed moisture eliminator, be dried coal dust after coal-grinding, can make coal dust in fluidized-bed or the abundant fluidisation of air flow bed moisture eliminator, can also make coal dust be dried to appointment water content, and without setting procedure complexity and expensive pre-drying device; Invention simultaneously also consider by coal-grinding and dry after all to adopt deep bed filter to carry out coal dust and gas separated, the gas re-circulation after separation enters system and reuses, and has greatly reduced the consumption of general facilities gas.
The utility model system has advantages of that investment in fixed assets is few, floor space is little, security of system is reliable and running cost is low.The utility model technique can be processed the powder process of high-moisture coal and dry, reaches corresponding dry requirement (concrete drying effect is controlled, the highest make the water-content in coal dust be down to 1.5% weight percent left and right) when making pulverized coal grinding to release mesh.The utility model technique is simple, easy and simple to handle, have coal-grinding concurrently simultaneously, dry multi-effect, has obvious economic benefit and social benefit.
The feed coal of year 410 tons of drying treatment of take is example, adopts powder process of the present utility model and dehumidification system to compare traditional predrying flow process, can economy system investment 1,800 ten thousand yuan, save 7,000,000 yuan of running costs.
Accompanying drawing explanation
Fig. 1 is the utility model system diagram.
Wherein: 1-coal pulverizer, the import of 1.1-feed coal, the hot gas approach of 1.2-, the 1.3-discharge that wets, 2-one-level deep bed filter 1, the 2.1-coal dust import of wetting, the 2.2-discharge that wets, 2.3-pneumatic outlet, 3-fluidized-bed, the 3.1-coal dust import of wetting, the outlet of 3.2-dry pulverized coal, the hot gas approach of 3.3-, 4-secondary deep bed filter 2, the import of 4.1-dry pulverized coal, the qualified discharge of 4.2-, 4.3-pneumatic outlet, 5-air blower, 6-pulverized coal firing boiler, the import of 6.1-bunker coal, 6.2-air intlet, the hot exhanst gas outlet of 6.3-, 7-desulfurizer, 8-tail-gas compressor.
Embodiment
Below in conjunction with accompanying drawing, the utility model is further explained to explanation:
With reference to accompanying drawing, described coal pulverizer 1 is established feed coal import 1.1, hot gas approach 1.2, wet discharge 1.3, described one-level deep bed filter 2 is established wet coal dust import 2.1, wet discharge 2.2 and pneumatic outlet 2.3, described fluidized-bed 3 is established wet coal dust import 3.1, dry pulverized coal outlet 3.2 and hot gas approach 3.3, described secondary deep bed filter 4 is established dry pulverized coal import 4.1, qualified discharge 4.2 and pneumatic outlet 4.3, and described pulverized coal firing boiler 6 is established bunker coal import 6.1, air intlet 6.2 and hot exhanst gas outlet 6.3.
The wet discharge 1.3 of coal pulverizer 1 connects one-level deep bed filter 2, fluidized-bed 3 and deep bed filter 4 successively through pipeline.Wherein, the wet discharge 1.3 of coal pulverizer 1 is connected with the wet coal dust import 2.1 of one-level deep bed filter 2, the wet discharge 2.2 of described one-level deep bed filter 2 also can be air flow bed moisture eliminator with fluidized-bed 3() coal dust import 3.1 be connected, the dry pulverized coal of fluidized-bed 3 outlet 3.2 is connected with the dry pulverized coal import 4.1 of deep bed filter 4.The hot exhanst gas outlet 6.3 of described pulverized coal firing boiler 6 is connected with the hot gas approach 1.2 of coal pulverizer 1.The pneumatic outlet 2.3,2.4 of described one-level deep bed filter 2 and secondary deep bed filter 4 is all connected with tail-gas compressor 8 with desulfurizer 7, and described tail-gas compressor 8 is connected with the hot exhanst gas outlet 6.3 of pulverized coal firing boiler 6.On described pipeline, as required valve, water pump etc. can be set, this is routine techniques, at this, is not described further.
The utility model processing method is: feed coal is sent into coal pulverizer 1 by feed coal import 1.1, in coal pulverizer 1, feed coal is entered by hot gas approach 1.2 when being fully ground to the coal dust of release mesh, combustion product gases from pulverized coal firing boiler 6 is fully dry, abrasive dust and dried coal dust by the discharge 1.3 that wets through pipeline, wet coal dust import 2.1 filters to isolate gas and coal dust by air conveying to the first deep bed filter 2, coal dust after filtration is through wet discharge 2.2, wet coal dust import 3.1 deliver to again fluidized-bed 3 by through hot gas approach 3.3, enter into, from the abundant fluidisation of combustion product gases of pulverized coal firing boiler 6 and dry, be dried to coal dust and the gas of specifying after water content and leave fluidized-bed 3 through dry pulverized coal outlet 3.2, through dry pulverized coal import 4.1, enter secondary deep bed filter 4 again, through deep bed filter 4, isolate gas and coal dust, the qualified coal dust in bottom is delivered to coal dust bunker through qualified discharge 4.2 and is stored, one-level deep bed filter 2 and secondary deep bed filter 4 top gas are after pneumatic outlet 2.3 and pneumatic outlet 4.3 discharges, most of after tail-gas compressor 8 compressions, mixes (volume ratio of mixing of the gas after compression and the combustion product gases of pulverized coal firing boiler is 0.5:10 to 2:10) with the combustion product gases of pulverized coal firing boiler 6 after for sending into coal pulverizer 1 and fluidized-bed 3 for being dried coal dust, small portion is disposed to atmosphere emptying after desulfurizer 7 desulfurization.Can to mix in system rare gas element with the Control for Oxygen Content that guarantees system in claimed range.
Claims (2)
1. the powder process of a high moisture low-rank coal and dehumidification system, comprise coal pulverizer, it is characterized in that, described coal pulverizer is connected successively with one-level deep bed filter, fluidized-bed or air flow bed moisture eliminator, secondary deep bed filter successively, and the hot gas approach of the gas approach of described coal pulverizer and fluidized-bed or air flow bed moisture eliminator is connected with the exhanst gas outlet of pulverized coal firing boiler.
2. powder process and the dehumidification system of the moisture low-rank coal of height as claimed in claim 1, is characterized in that, the pneumatic outlet of described one-level deep bed filter and secondary deep bed filter is connected with the hot exhanst gas outlet of pulverized coal firing boiler through tail-gas compressor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320523385.0U CN203474749U (en) | 2013-08-26 | 2013-08-26 | Powdering and drying system of low-rank coal with high water content |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320523385.0U CN203474749U (en) | 2013-08-26 | 2013-08-26 | Powdering and drying system of low-rank coal with high water content |
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| CN203474749U true CN203474749U (en) | 2014-03-12 |
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| CN201320523385.0U Expired - Lifetime CN203474749U (en) | 2013-08-26 | 2013-08-26 | Powdering and drying system of low-rank coal with high water content |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110369058A (en) * | 2019-07-27 | 2019-10-25 | 沛县祥龙矿山机械配件有限公司 | A kind of heat power plant boiler low speed coal mill matched auxiliaring equipment |
-
2013
- 2013-08-26 CN CN201320523385.0U patent/CN203474749U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110369058A (en) * | 2019-07-27 | 2019-10-25 | 沛县祥龙矿山机械配件有限公司 | A kind of heat power plant boiler low speed coal mill matched auxiliaring equipment |
| CN110369058B (en) * | 2019-07-27 | 2021-02-26 | 沛县祥龙矿山机械配件有限公司 | Auxiliary equipment matched with steel ball coal mill of boiler of thermal power plant |
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